TD060100-0MA
10
2
Operation
Description
The
JC-MER-CXB
integrates Metasys
N1 LAN
segments with an
Ethernet network that uses the TCP/IP
(Transmission Control
Protocol/Internet Protocol) suite. The router
provides the physical
connection between a Metasys ARCNET
segment and the Ethernet
network. It takes advantage of a
customer’s existing Ethernet
network, while maintaining the
dedicated Facility Management
System (FMS) communications
necessary for complex, time-critical,
local control strategies.
With the
JC-MER-CXB
, Metasys controllers
communicate transparently
over
Ethernet, using standard
components and maintaining complete
compatibility with existing
network equipment. From an operator’s
view, this coupling of the
N1 LAN to Ethernet creates a single large
network. No special
commands are necessary to switch between
networks; data
automatically transmits between networks without
operator
knowledge or intervention.
The
JC-MER-CXB
communicates over an
Ethernet network using the
TCP/IP
protocol. Two networked
JC-MER-CXB
s pass ARCNET
data
between
themselves using the User Datagram Protocol (UDP)
service
provided by TCP/IP. On the Ethernet network, the router is
seen as a
workstation passing messages to another workstation. If a
power
failure occurs, the router automatically restarts communications
once
power is restored.
The
JC-MER-CXB
is derived from
an earlier version of this device that
was an expansion module that occupied
two slots of a Contemporary
Controls
MOD HUB ARCNET
Modular
Active Hub
. The new device
can be powered from an available low-voltage source or with an
optional wall-mount transformer.
The
ARCNET and the
Ethernet
connection
s
are
made through port
s
on the
front panel of the device.
Unlike a PMI/OWS, the JC-MER-CXB has no monitor or keyboard.
Instead,
the
monitor/keyboard functionality is
done
by an external
laptop or desktop
computer running a terminal emulation program
(like
HyperTerminal), while connected to COM ports on the
JC-MER-CXB.